Niobium
Symbol
Nb
Atomic Number
41
Atomic Weight
92.90638
Element Classification
Discovered By
Charles Hatchet
Discovery Date
1801 (England)
Name Origin
Niobe; daughter of the mythical Greek king Tantalus.
Density (g/cc)
8.57
Melting Point (K)
2741
Boiling Point (K)
5015
Appearance
Shiny white, soft, ductile metal
Atomic Radius (pm)
146
Atomic Volume (cc/mol)
10.8
Covalent Radius (pm)
134
Ionic Radius
69 (+5e)
Specific Heat
0.268
Fusion Heat (kJ/mol)
26.8
Evaporation Heat (kJ/mol)
680
Thermal Conductivity (@25°C W/m K)
53.7
Debye Temperature (K)
275.00
Pauling Negativity Number
1.6
First Ionizing Energy (kJ/mol)
663.6
Oxidation States
5, 3
Electronic Configuration
[Kr] 4d4 5s1
Lattice Structure
Body-Centered Cubic(BCC)
Lattice Constant
3.300
Lattice C/A Ratio
n/a
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